Have you got version 12.1 of the software? Have you gone to Help/check for Updates to get it?
Have you also ensured you have the latest version of Quicktime from Apple?
BTW, are you on Windows 7, 8 or Mac OSX?
Yes I have version 12.1 of Premier Elements. Adobe claims this has been an
issue that they have not been able to resolve since Premier 8 came out. I
guess I just need to live with it from the way it sounds.
I'm also on a PC running windows 7 and have the latest versions of
Quicktime and Itunes.
Just a note that the present discussion does not touch on the fact that saved/closed rendered and then re-opened unrendered look is a long time Premiere Elements known issue. It dates back several versions and is associated with various computer operating systems, and a spectrum of source media. In this issue, the preview files of the render remain alive and well in their hard drive save location. There is no fix other than to move on in the re-opened project or re-render or not render as is felt necessary in the re-opened project. The event can be encountered all the time or only sometime for a given user. And, one user can experience the problem while another does not.